| 摘要 |
A synchronous rectifier circuit of a three-phase step down resonant type according to the present invention, connected to a resonant circuit unit in which three-phase alternating current power sources (Va, Vb, Vc) includes each of reactors (La ,Lb, Lc) and capacitors (Ca, Cb, Cc), wherein the resonant circuit unit comprises a circuit connected to a neutral point of top diodes (D1, D2, D3) and bottom diodes (D4, D5, D6) of a three-phase diode bridge rectifier unit, is configured in that: a first switching element (Q1) is connected to an anode unit of the top diodes (D1, D2, D3) of the three-phase diode bridge rectifier unit, and a second switching element (Q2) is connected to a cathode unit of the bottom diodes (D4, D5, D6); a series connection of first and second capacitors (C1, C2), a series connection of third and fourth capacitors (C3, C4) and a series connection of first and second diodes (D7, D8) are parallel-connected to the three-phase diode bridge rectifier unit, respectively; the first and second switching elements (Q1, Q2) are connected between the series connection of the first and second capacitors (C1, C2) and the series connection of the first and second diodes (D7, D8), respectively; and a neutral point (N1) of the first and second capacitors (C1, C2) and a neutral point (N2) of the first and second diodes (D7 ,D8) are connected through a first reactor (Lsn), and a neutral (N3) of the of third and fourth capacitors (C3, C4) and a terminal part of the capacitors (Ca, Cb, Cc) of the resonant circuit are connected to each other through a second reactor (Lr). |
